The debate provides Biden, the 81-year-old Democratic incumbent, the chance to reassure voters he's capable of guiding the US through a host of challenges as he moved to sharpen the choice voters will face in November.
Trump, 78, had the opening to try to move past his felony conviction in New York and convince an audience of tens of millions that he is temperamentally suited to return to the Oval Office.
Trump and Biden entered the night facing stiff headwinds, including a public weary of the tumult of partisan politics and broadly dissatisfied with both, according to polling.
But the debate was highlighting how they have sharply different visions on virtually every core issue — abortion, the economy and foreign policy — and deep hostility toward each other.
The two candidates strode on stage and walked directly to their lecterns, avoiding a handshake.
The current president and his predecessor hadn't spoken since their last debate weeks before the 2020 presidential election.
Trump skipped Biden's inauguration after leading an unprecedented and unsuccessful effort to overturn his loss that culminated in the January 6 Capitol insurrection by his supporters.
Trump has promised sweeping plans to remake the US government if he returns to the White House and Biden argues that his opponent would pose an existential threat to the nation's democracy.
Thursday's broadcast on CNN, moderated by anchors Jake Tapper and Dana Bash, marked the earliest general election debate in history.
It's the first-ever televised general election presidential debate hosted by a single news outlet after both campaigns ditched the bipartisan Commission on Presidential Debates, which had organized every matchup since 1988.
Aiming to avoid a repeat of their chaotic 2020 matchups, Biden insisted — and Trump agreed — to hold the debate without an audience and to allow the network to mute the candidates' microphones when it is not their turn to speak.
The debate's two commercial breaks offered another departure from modern practice, while the candidates have agreed not to consult staff or others while the cameras are off.
Trump and his aides have spent months chronicling what they argue are signs of Biden's diminished stamina.
In recent days, they've started to predict Biden will be stronger on Thursday, aiming to raise expectations for the incumbent.
Biden's team too predicted that he would rise to the occasion, and expressed hope that Trump would be forced to address his positions they believe are anathema to voters.
"Joe's ready to go. He's prepared. He's confident," his wife, Jill Biden, told donors ahead of the debate. "You know what a great debater he is."
Heading out of the debate, both Biden and Trump will travel to states they hope to swing their way this fall. Trump is heading to Virginia, a one-time battleground that has shifted toward Democrats in recent years.
Biden is set to jet off to North Carolina, where he is expected to hold the largest-yet rally of his campaign in a state Trump narrowly carried in 2020.
With AP
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